18056043549 has 18 divisors (see below), whose sum is σ = 26804911770. Its totient is φ = 11712020256.

The previous prime is 18056043457. The next prime is 18056043559. The reversal of 18056043549 is 94534065081.

18056043549 is a `hidden beast` number, since 1 + 8 + 0 + 5 + 60 + 43 + 549 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 15805015524 + 2251028025 = 125718^2 + 47445^2 .

It is not a de Polignac number, because 18056043549 - 2¹⁶ = 18055978013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18056043559) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 720414 + ... + 745055.

It is an arithmetic number, because the mean of its divisors is an integer number (1489161765).

Almost surely, 2^18056043549 is an apocalyptic number.

It is an amenable number.

18056043549 is a deficient number, since it is larger than the sum of its proper divisors (8748868221).

18056043549 is a wasteful number, since it uses less digits than its factorization.

18056043549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465549 (or 1465509 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 18056043549 in words is "eighteen billion, fifty-six million, forty-three thousand, five hundred forty-nine".